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lecture13 - CSE 471 Media Processing and Multimedia More...

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1 CSE 471 Media Processing and Multimedia More Image Processing Operations Some operations we want to cover Edge detection, enhancement, etc. Region growing
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2 CSE 471 Media Processing and Multimedia Edge Detection We want to find the boundary between two regions – abrupt change We’re looking for derivatives A derivative is a type of high-pass filter What’s a derivative in 2D?
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3 CSE 471 Media Processing and Multimedia Gradients An image gradient consists of the horizontal and vertical partial derivatives = = y I x I G G I y x
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4 CSE 471 Media Processing and Multimedia Derivative Estimators Most trivial: Simple difference Note: All must add to zero Problems: Derivatives enhance noise We desire some filtering We prefer odd sized filters, not even Note relation to high-pass filtering… -1 1 -1 1 Horz: Vert: = = y I x I G G I y x
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